<html><head>
  <title>:only-of-type pseudo-class</title>
  <style type="text/css">.red { background-color : red }
.t1 :only-of-type { background-color : lime }
</style>
  <link rel="author" title="Daniel Glazman" href="http://glazman.org/">
  <link rel="help" href="https://www.w3.org/TR/css3-selectors/#selectors"> <!-- bogus link to make sure it gets found -->
  <meta name="flags" content="">
 </head>
 <body>
<div class="t1">
<p>This paragraph should have normal background</p>
<!--[ELEMENT('.red')]--><address class="red"><!--[TEXT('.red')]-->But this address should have green background<!--[/TEXT('.red')]--></address><!--[/ELEMENT('.red')]-->
<p>This paragraph should have normal background</p>
</div>

</body></html>